Abstract: The suspension system is used to observe the vibrations from shock loads due to irregularities of the road surface. It performs its function without impairing the stability, steering (or) general handling of the vehicle. An off-road vehicle (BAJA ATV here) has limited power and has to endure through rough tracks so weight reduction of the vehicle becomes an important aspect. This investigation includes comparison of modelling and analyses of primary suspension spring of materials ASTM a229 and ASTM a227 and suggested the suitability for optimum design. The results show the reduction in overall stress and deflection of spring for chosen materials.

Keywords: Suspension, Coil Spring, Off road, BAJA, CATIA, ANSYS, Simulation, Maneuverability, ASTM.